ISO 48-4:2018 pdf download

ISO 48-4:2018 pdf download.Rubber, vulcanized or thermoplastic Determination of hardness Part 4: Indentation hardness by durometer method (Shore hardness).
ISO/TC 45/SC 2 established a principle that it would be helpful for users ifstandirds on the same subject but covenng different aspects or methods were grouped together, reterabIy with an introductory guidance standard, rather than being scattered throughout the numbering system. This has 1)eefl achieved for some subjects, for example curemeters (ISo 6502) and dynamic properties (ISO 4664).
In 2017, it was decided to group standards for hardness and, subsequently, it was agreed that they would be grouped under the ISO 48 number. The new standards together with the l)reV1OUSIY numbered standards are listed below.
— ISO 48—1: former ISO 18517
— ISO 48-2: fiwmer ISO 48
— ISO 48-3: former ISO 27588
— ISO 48-4: former ISO 7619-1
— ISO 48-5: former ISO 7619-2
— ISO 48-6: former ISO 7267-1
Because of these factors, it is inadvisable to relate results using a durometer (Shore hardness) directly to I RI ID values, although corrilat IOnS have been established for SOflR’ ifldiVi(IWd rul)berS i nd compounds.
I)urometers were originally portable hand—held instruments that have proved to he particularly convenient br making measurements on products. By now a lot of laI)oratories also use them on a stand with a weight applied to the pressure foot in order to improve precision significantly.
NOTl ISO 48-2 specilies hardness nwasurements for determination of hardness between 10 IRIID and
100 I RI ID. Further information on the relationship between the dur()meter values and I RI ID values is given in
References 151 11I21.
The io1Ioving (loculuents arc referred to in (1w text lfl Such a way that some or all of (twit- content constitutes requirements of ISO 48-4. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 48—9, Rubbe,; vulcunlze(l or thermoplastic — Determination of hclr(lness — Part 9: calibration (111(1
verification of Iia rdi iess testers
ISO 23529, Rubber — General procedures orprepariiq and conditioning test pieces Jar 1)ftvsicul test methods
The pressure foot for types A and 1) shall have a diameter of 18 mm ± 0,5 mm and a central hole of (ha meter 3 mm ± 0,1 m in. For type AO, the pressu rC k)Ot shall have a mi fl i mum area of 500 in m 2 with a central hole of diameter 5,4 mm ± 0,2 mm. The tolerances on the dimension of the central hole and the requirement for the size of the pressure loot only apply to instruments used on a stand.
6.1.2 Inclentor
The indentor shall be formed from a hardened—steel rod of diameter 1,25 mm ± 0,15 mm to the shape and dimensions shown in Figure 1 for type A durometers and Figure 2 for type I) durometers. Fype AO durometers shall have a round indentor with a radius of2,5 mm ± 0,02 mm in accordance with Figure 3.
6.1.3 Indicating device
This is a device for allowing the extent of protrusion of the point of the indentor beyond the face of the pressure foot to be read. It shall be calibrated directly in terms of units ranging from 0 [or the maximum protrusion of 2,5() mm ± 0,02 mm to 100 for ZC() protrusion obtained by placing the Iwessiie foot and indentor in firm contact with a suitable flat, hard surface [e.g. glass).ISO-48-4-2018

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